Valve tester



May 15, 1923.

5. MY COF'FMAN VALVE TESTER Filed Dec.

I /dA INVENTORZ S (1/72 ad M. (0W a/z,

76% ATTORNEY Patented May 15, 1923.

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T'o' a'll ivhbm mi zi concern." v, Be it known that I, SAMUEL M. COFFMAN,

a citizen of the United States, residing at Kansas City, tliecounty of Jackson and State of Missouri, have invented certain new and useful Improvements in Valve Testers, of whichthe following is aspecification. y My invention relatesto pneumatic de- 0 vices for testing the poppet valves of internal combustion engines, and my object is to provide a simple and inexpensive device of this character whereby it can be readily determined whether or not there is any leakage between said valves and their respective seats.

In order that the invention may be fully understood, reference will now be had to the accompanying drawing, in which:

Fig. 1 is a side elevation of one form of the device for testingthe valves and their seats by the application of air under pressure.

Fig. 2 is an enlarged broken sectional view on line 11-11 of Fig. 3.

Fig. 3 is a broken plan view of the device.

Fig. 4 shows another form of the device whereby the valves and their seats may be tested either by the application of air under 30 pressure, or by vacuum.

In the form disclosed by Figs. 1 to 3, inclusive, a standard 2 is employed and provided at its upper end with a knob 4 and at its lower end with a circular head 6 having a chambered underside 8, as disclosed by Fig. 2. The underside of the head 6, also, has an annular groove 10 in which a rubber or other suitable gasket 12 is fixed. The head 6 is also provided near its periphery with a vertically-extending bracket 14 having an annular shoulder 16 to which one end ofa basket-like guard 18 is clamped through the intermediacy of screws 20.

22 designates an elastic air container disposed within the guard 18 and having its forward open end firmly secured to one end of a valve 24 connected to the standard 2 and projecting through the annular shoulders 16. The valve 24 has a duct 26 communicating with the upper end of a duct 28 extending downwardly through the standard 2 and communicating with the chamber 8.

In practice the container 22 is charged with a suitable fluid such as air under pressure introduced through the ducts 28 and 26 in any suitable ma ner and retained within the container byclo'sing the valve 24. When the device is to be'us e'd it is placed in position on top of the engine cylinder A, with the gasket l2 surrounding the valve B,

22 owing to air escaping therefrom and leaking between said valve B and its seat, thus indicating that these parts need grinding to obtain a perfect fit. On the other hand if there is no leakage of air between.

the valve B and its seat there will be no loss of air from the container 22, nor visible contraction of the same. After the test has been made the valve 24 is closed, so that there will be no leakage of air from the container 22 when the device is removed from position over the valve B. By thus conserving the air within the container 22 one charging thereof will suffice for the testing of a large number of valves. Only a very short period of time is required to test all the valves of a multi-cylinder engine.

In the form disclosed by Fig. 4, the construction of the standard 2 and its integral parts is the same as that of the preferred form as evidenced by corresponding reference numerals with exponents a. The

,guard 18 is dispensed with and a rubber bulb 22*, such as commonly employed on atomizers and syringes but without valves of any description, is substituted for the air container 22*.

The bulb 22 has but one open end which is secured to the valve 24. When this form of device is placed in position over a valve and pressure of the hand is applied to compress the bulb 22, it is readily determined whether or not there is any leakage around the valve B by the action of the bulb 22. For instance, if there is any leakage around said valve B the bulb 22 can be readily compressed with the hand to force the air from said bulb through the ducts in the valve 26. and the standard 2 but if a perfeet fit exists between the bulb B and its 'seat it will be diflicult if not impossible to compress thebulb 22 If desired a vacuum test instead of a direct air pressure test can be made by first compressing the bulb 22, to expel the air therefrom. The bulb 22 is held in a vcom pressed condition until the head 6 is placed in position over the valve B, whereupon the bulb 22? is released. If there is any leakage' around the valve B it becomes evident bythe air flowing into and restoring the I bulb 22 to normal condition, but if no leakprising a chambered head, a gasket recessed into saidchambered head, a standard surmounting said chambered head and having a duct leading thereto, a knob surmounting said duct, a valve connected to the standard and having a duct communicating with the first-mentioned duct, an elastic air container secured to said valve, a bracket extending upwardly from the chambered head and provided with an annular shoulder, and

a guard clamped to. said shoulder toprotect the air container. I a In testimony whereof I aflix my signature, in the presence-of two wltnesses. 7

SAMUEL (lOFFMAN, Witnesses: ,1

F. G. F IsoHE n, i L. J. FISCHER. v 

